Cache Hits and Misses Explained
Understand cache hits and misses with a runnable Python example, expiration, invalidation, practical use cases and caching trade-offs.
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Single-Flight Request Coalescing Explained
Learn how single-flight request coalescing prevents cache stampedes, reduces database queries, and improves Python API performance.
UTM Parameters Explained: How They Work & Examples
What are UTM parameters and how do they work? Learn to create tracking links, measure campaigns in GA4, and avoid common mistakes with examples.
Design Language vs Design System: Explained
Learn the difference between design language and design system with simple examples, comparisons, and real case studies from top companies.
Add MCP Servers in Codex, Claude Code, and Gemini
Learn what MCP (Model Context Protocol) is, why it’s useful, and how to add MCP servers (Notion, Sentry, Context7) in OpenAI Codex, Claude Code, and Gemini CLI.
Debounce vs. Throttle: The Ultimate Guide for Web Developers
A detailed guide for developers explaining the difference between debounce and throttle. Learn what they are, when to use them, and see real-world JavaScript examples and code to …
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when you see them.
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Explore visual lessonsData structures & algorithms · System design
Beginner
Binary search
One comparison. Half the possibilities.
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12
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23
38
Looking for 23: 12 is too small. Keep the right half.
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O(log n)
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